Definition of "herein" []

• In or into this. (adverb)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "The North Pole, he said, was not so very far away, and the difficulties in the way of reaching it were not, on the face of them, so very great: human ingenuity had achieved a thousand things a thousand times more difficult; yet in spite of over half-a-dozen well-planned efforts in the nineteenth century, and thirty-one in the twentieth, man had never reached: always he had been baulked, baulked, by some seeming chance -- some restraining Hand: and herein lay the lesson -- _herein the warning_."
• "I hereby certify that all the information contained herein is true to the best of my knowledge and belief and that I will pay the taxes for which I have received tax allowances from the Fund. [emphasis added]"
• "The deceit herein is that, in reality, the world of work has been, for the most part, an extremely unpleasant world in which to live - until quite recently."